runtime, runtime/msan: add msan runtime support

These are the runtime support functions for letting Go code interoperate
with the C/C++ memory sanitizer.  Calls to msanread/msanwrite are now
inserted by the compiler with the -msan option.  Calls to
msanmalloc/msanfree will be from other runtime functions in a subsequent
CL.

Change-Id: I64fb061b38cc6519153face242eccd291c07d1f2
Reviewed-on: https://go-review.googlesource.com/16162
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/runtime/msan/msan.go b/src/runtime/msan/msan.go
new file mode 100644
index 0000000000..b6ea3f0d16
--- /dev/null
+++ b/src/runtime/msan/msan.go
@@ -0,0 +1,32 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build msan,linux,amd64
+
+package msan
+
+/*
+#cgo CFLAGS: -fsanitize=memory
+#cgo LDFLAGS: -fsanitize=memory
+
+#include <stdint.h>
+#include <sanitizer/msan_interface.h>
+
+void __msan_read_go(void *addr, uintptr_t sz) {
+	__msan_check_mem_is_initialized(addr, sz);
+}
+
+void __msan_write_go(void *addr, uintptr_t sz) {
+	__msan_unpoison(addr, sz);
+}
+
+void __msan_malloc_go(void *addr, uintptr_t sz) {
+	__msan_unpoison(addr, sz);
+}
+
+void __msan_free_go(void *addr, uintptr_t sz) {
+	__msan_poison(addr, sz);
+}
+*/
+import "C"